【摘要】：感應(yīng)電機雙PWM變流器由PWM整流器和PWM逆變器通過直流環(huán)節(jié)連接構(gòu)成，研究其控制策略對于提高系統(tǒng)性能具有重要意義。近年來，模型預(yù)測控制憑借其在解決多約束、多目標(biāo)優(yōu)化等方面的優(yōu)勢，在電力電子領(lǐng)域得到諸多應(yīng)用。本文對感應(yīng)電機雙PWM變流器有限控制集模型預(yù)測控制（FCS-MPC）及改進(jìn)控制策略進(jìn)行了研究。 首先，以兩電平PWM整流器為對象，介紹了FCS-MPC策略的基本原理。針對FCS-MPC存在的開關(guān)頻率非恒定和采樣頻率較高的缺點，，給出了一種PWM整流器有限開關(guān)序列模型預(yù)測電流控制（FSS-MPCC）策略。PWM整流器FSS-MPCC通過構(gòu)建12組開關(guān)序列作為控制集，采用無差拍控制方式求取每組開關(guān)序列內(nèi)各個開關(guān)狀態(tài)的作用時間，構(gòu)建目標(biāo)函數(shù)，在線尋優(yōu)。通過MATLAB軟件驗證了PWM整流器FSS-MPCC的有效性，并與FCS-MPC進(jìn)行了對比分析，表明了所給出的FSS-MPCC能在較低采樣頻率下實現(xiàn)恒頻控制，且仍具有FCS-MPC的高動態(tài)性能。 其次，研究了一種三電平PWM整流器模型預(yù)測電流控制（MPCC）策略。針對中點電位波動問題，分析了不同電壓矢量對中點電位的影響，給出了一種基于查表的中點電位平衡控制方法。建立了三電平PWM整流器αβ坐標(biāo)系下的數(shù)學(xué)模型，設(shè)計了三電平PWM整流器MPCC控制系統(tǒng)，并進(jìn)行延時補償。對整流器MPCC系統(tǒng)進(jìn)行了仿真分析，驗證了所給出的中點電位平衡方法的有效性。 再次，為優(yōu)化MPCC尋優(yōu)過程、減少計算量，給出了一種感應(yīng)電機NPC三電平逆變器準(zhǔn)無差拍模型預(yù)測電流控制（QD-MPCC）策略。設(shè)計了感應(yīng)電機QD-MPCC準(zhǔn)無差拍控制器，求出電機定子給定電壓矢量，預(yù)測定子電流，構(gòu)建目標(biāo)函數(shù)，從其所處扇區(qū)包含的電壓矢量中尋優(yōu)，減少滾動次數(shù)，提升尋優(yōu)效率，進(jìn)而減少計算耗時。設(shè)計了基于QD-MPCC的感應(yīng)電機控制系統(tǒng)，進(jìn)行了數(shù)字延時補償，在系統(tǒng)中采用了一種閉環(huán)磁鏈觀測器以提高磁鏈觀測精度。通過仿真驗證了感應(yīng)電機QD-MPCC策略的有效性，表明了感應(yīng)電機QD-MPCC系統(tǒng)具有良好的動靜態(tài)性能和較強的魯棒性。 最后，介紹了PWM整流器實驗平臺和感應(yīng)電機QD-MPCC系統(tǒng)實驗平臺，進(jìn)行了實驗研究，分析了實驗結(jié)果，進(jìn)一步驗證了所述控制策略的有效性。
[Abstract]:The double PWM converter of induction motor is composed of PWM rectifier and PWM inverter connected by DC link. It is very important to study its control strategy for improving the system performance. In recent years, model predictive control (MPC) has been widely used in power electronics field because of its advantages in solving multi-constraint and multi-objective optimization. In this paper, the finite control set predictive control (FCS-MPC) and improved control strategy for dual PWM converter of induction motor are studied. Firstly, the basic principle of FCS-MPC strategy is introduced based on the two-level PWM rectifier. Aiming at the disadvantage of unsteady switching frequency and high sampling frequency in FCS-MPC, This paper presents a predictive current control (FSS-MPCC) strategy for finite switching sequence model of PWM rectifier. PWM rectifier FSS-MPCC constructs 12 sets of switching sequences as control set. The action time of each switching state in each group of switch sequences is obtained by using the deadbeat control method, and the objective function is constructed to search for the best on line. The validity of PWM rectifier FSS-MPCC is verified by MATLAB software, and compared with that of FCS-MPC. It is shown that the proposed FSS-MPCC can realize constant frequency control at lower sampling frequency and still has the high dynamic performance of FCS-MPC. Secondly, a three-level PWM rectifier model predictive current control (MPCC) strategy is studied. The effect of different voltage vectors on midpoint potential is analyzed, and a control method of midpoint potential balance based on look-up table is presented. The mathematical model of three-level PWM rectifier in 偽 尾 coordinate system is established, and the MPCC control system of three-level PWM rectifier is designed, and the delay compensation is carried out. The simulation analysis of rectifier MPCC system is carried out to verify the effectiveness of the proposed midpoint potential balance method. Thirdly, in order to optimize the MPCC optimization process and reduce the computational complexity, a quasi-deadbeat model predictive current control (QD-MPCC) strategy for NPC three-level inverter of induction motor is presented. The QD-MPCC quasi beat controller of induction motor is designed, the stator voltage vector is given, the stator current is predicted, the objective function is constructed, and the optimization is obtained from the voltage vector contained in the sector, which can reduce the rolling times and improve the optimization efficiency. Thus, the computational time is reduced. The control system of induction motor based on QD-MPCC is designed, and the digital delay compensation is carried out. A closed loop flux observer is used to improve the observation accuracy of the flux. The effectiveness of the QD-MPCC strategy of induction motor is verified by simulation. It is shown that the induction motor QD-MPCC system has good dynamic and static performance and strong robustness. Finally, the experimental platform of PWM rectifier and QD-MPCC system of induction motor is introduced. The experimental results are analyzed and the effectiveness of the control strategy is further verified.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張純江,顧和榮,趙清林,張秀紅;單周期控制無乘法器三相電壓型PWM整流器[J];電工技術(shù)學(xué)報;2003年06期

2 楊勇;趙方平;阮毅;趙春江;;三相并網(wǎng)逆變器模型電流預(yù)測控制技術(shù)[J];電工技術(shù)學(xué)報;2011年06期

3 何必;喬鳴忠;林樺;佘宏武;王興偉;;矩陣變換器輸入功率因數(shù)可調(diào)時的換流控制策略[J];電工技術(shù)學(xué)報;2012年07期

4 張輝;譚國俊;錢苗旺;魚瑞文;;基于H_∞控制與最優(yōu)跟蹤控制相結(jié)合的三相PWM整流器控制策略[J];電工技術(shù)學(xué)報;2012年12期

5 陸文斌;姚文熙;呂征宇;;基于改進(jìn)閉環(huán)磁鏈觀測器的感應(yīng)電機無速度矢量控制[J];電工技術(shù)學(xué)報;2013年03期

6 宋戰(zhàn)鋒;夏長亮;谷鑫;;靜止坐標(biāo)系下基于最優(yōu)時間序列的電壓型PWM整流器電流預(yù)測控制[J];電工技術(shù)學(xué)報;2013年03期

7 席裕庚,許曉嗚,張鐘俊;預(yù)測控制的研究現(xiàn)狀和多層智能預(yù)測控制[J];控制理論與應(yīng)用;1989年02期

8 席裕庚;李德偉;;預(yù)測控制定性綜合理論的基本思路和研究現(xiàn)狀[J];自動化學(xué)報;2008年10期

9 賀娜;姜斌;齊瑞云;;基于模型預(yù)測控制的近空間飛行器容錯跟蹤控制[J];航天控制;2012年06期

10 席裕庚;李德偉;林姝;;模型預(yù)測控制——現(xiàn)狀與挑戰(zhàn)[J];自動化學(xué)報;2013年03期

相關(guān)博士學(xué)位論文 前1條

1 韓耀飛;MW級異步電機雙三電平變頻系統(tǒng)研究[D];中國礦業(yè)大學(xué);2010年

本文編號：2324091